2156518 has 48 divisors (see below), whose sum is σ = 4332384. Its totient is φ = 783360.

The previous prime is 2156507. The next prime is 2156521. The reversal of 2156518 is 8156512.

Its product of digits (2400) is a multiple of the sum of its prime divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52578 + ... + 52618.

It is an arithmetic number, because the mean of its divisors is an integer number (90258).

2^2156518 is an apocalyptic number.

2156518 is an abundant number, since it is smaller than the sum of its proper divisors (2175866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156518 is a wasteful number, since it uses less digits than its factorization.

2156518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 80 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 2156518 is about 1468.5087674236. The cubic root of 2156518 is about 129.1965834738.

It can be divided in two parts, 2 and 156518, that added together give a triangular number (156520 = T₅₅₉).

The spelling of 2156518 in words is "two million, one hundred fifty-six thousand, five hundred eighteen".